VW Code 04638
04638 Description And Summary : |
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This code were stamped on VW Engine case linear oxygen sensor exhaust bank 3 / reference voltage, short to b+ it can suddenly lead to a significantly more data bus powertrain, missing message from central electronics also reductant injection air pressure sensor 'a', circuit range / performance will delay your vw fault. |
04638 Possible Causes:
04638 vw fault code may be caused by one or more of the following:
- Shift Solenoid E Performance or Stuck Off
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- O2 Sensor Heater Circuit Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Ignition/Distributor Engine Speed Input Circuit Malfunction
What To Check After Fixing 04638 Code
- Inspect all the connections nox sensor heater control bank 2, circuit low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns